The answer of Crockford Management:
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Hi Enzo,
Thanks for your message. There is a large amount of material over the years that is never released officially!
There are many reasons why recordings may not be released - it may be that the quality is not considered high enough (as Mark only releases things he is 100% completely happy with), sometimes they were never recorded with intention to release them officially so are therefore not complete or suitable, sometimes the recordings are lost, damaged, or misfiled.
Apologies to not have a solid answer for the performances you have mentioned, but unfortunately I cannot find out the specific reasons for them not being released. If they haven’t been released yet, then they are unlikely to be in future.
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"the quality is not considered high enough" is something that always makes me laugh, included when Guy says that "unreleased stuff remains unreleased for a good reason".
Guy referred to a song titled "Back in the day" that was supposed to be a bonus track for the DTRW record, in the Kansas diary entry, as "
Mark wrote a song about it intended for the last album which remains an unreleased gem"
It is known that from the STP record there are at least another unreleased gem titled "Bonafide" that was good enough to be part of the STP tour rehearsals, together with another unreleased, "Pyroman". It's also known that from the GL sessions there was another unreleased gem titled "Bonfire night", and these are only the ones we know, I'm sure that if I had the chance to listen to all that unreleased songs, I would be able to set up a high quality record to be released immediately...
But the thing is MK only look forward, so his way to do that is forget about all that unreleased stuff and keep releasing new songs.
I guess that if someday he has a writers block, he might take those unreleased songs and release them, but, actually, DTRW has some songs that were left out for other previous records together with new songs, something he had to do because he was working in the record and in the musical at the same time, so he was creatively more focused in the musical, that was something new he had never done before, than in the record itself.
Despite that, I love DTRW, and I'm sure I would love, and all of you would love, the record that could be done with all that unreleased gems...
One last thing. When you ask Led Zeppelin fans which one is their favourite Zepp record, most of them (including me) would say "Physical Graffiti", a double record made of songs left out of all the previous Zeppelin records. And it includes some of the all time Zepp classics!